【High-Quality Sound】 Designed and manufactured specifically for the DL103, it was sold as a set with the DL103 cartridge. DENON's AU-305 transformer was created to match the impedance of the DL103 to maximize its original sound quality. By eliminating the input impedance switching contacts, it delivers a clear and dynamic sound. 【Versatile Connectivity】 It features RCA input and output terminals, allowing for easy connection to audio equipment with PONO inputs. Compared to an MC head amplifier, you can enjoy records with a natural sound and excellent overall balance. - Brand: DENON - Model: AU-305 - Input Terminals: RCA terminals (red/white) - Output Terminals: RCA terminals with dedicated cord (red/white) - Function: Transformer - Color: Black - Country of Manufacture: Japan While packing, the frame of the switch part seems to have sunk in. There are no problems with the up and down switches, but please refrain from purchasing if you are concerned. There are no particular problems with its use. See the last photo.